编译/程序运行时执行XAML(Compile/Execute XAML during program

我想创建其中从数据库中检索XAML代码，并显示检索到的代码的WPF应用程序。

比方说数据库返回下面的代码：

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid x:Name="mainGrid">
        <Button Content="test case 1" 
                HorizontalAlignment="Left" 
                Margin="10,10,0,0" 
                VerticalAlignment="Top" 
                Width="100" 
                Click="TestCase1_OnClick" 
                Height="29"/>
    </Grid>
</Window>

我如何在运行时执行该代码（或者只是在mainGrid的内容）？

Answer 1:

XamlReader类intened用于这一目的。使用其负载的方法来动态加载XAML。

编辑-此链接这里可能是你的兴趣。

Answer 2:

这是我如何解决了这个问题：

我有3个文件MainWindow.xaml，MainWindow.xaml.cs和wpftest.csproj。

MainWindow.xaml：

<Window x:Class="wpftest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Button Content="Button" HorizontalAlignment="Left" Margin="122,75,0,0" VerticalAlignment="Top" Width="75" Click="ButtonBase_OnClick"/>
    </Grid>
</Window>

MainWindow.xaml.cs

namespace wpftest
{
    using System.Windows;

    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("Hello world", "does it work?");
        }
    }
}

wpftest.csproj（注：这个文件非常大，大部分的东西是没有必要的，您可以按照本指南操作创建一个更简化的解决方案：演练：从头创建一个MSBuild项目文件）

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
    <ProjectGuid>{E3FBAE41-AF7E-4C7E-A69E-ADAEAEE76FA2}</ProjectGuid>
    <OutputType>Library</OutputType>
    <AppDesignerFolder>Properties</AppDesignerFolder>
    <RootNamespace>wpftest</RootNamespace>
    <AssemblyName>wpftest</AssemblyName>
    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
    <FileAlignment>512</FileAlignment>
    <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
    <WarningLevel>4</WarningLevel>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
    <PlatformTarget>AnyCPU</PlatformTarget>
    <DebugSymbols>true</DebugSymbols>
    <DebugType>full</DebugType>
    <Optimize>false</Optimize>
    <OutputPath>bin\Debug\</OutputPath>
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
    <PlatformTarget>AnyCPU</PlatformTarget>
    <DebugType>pdbonly</DebugType>
    <Optimize>true</Optimize>
    <OutputPath>bin\Release\</OutputPath>
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
  </PropertyGroup>
  <ItemGroup>
    <Reference Include="System" />
    <Reference Include="System.Data" />
    <Reference Include="System.Xml" />
    <Reference Include="Microsoft.CSharp" />
    <Reference Include="System.Core" />
    <Reference Include="System.Xml.Linq" />
    <Reference Include="System.Data.DataSetExtensions" />
    <Reference Include="System.Xaml">
      <RequiredTargetFramework>4.0</RequiredTargetFramework>
    </Reference>
    <Reference Include="WindowsBase" />
    <Reference Include="PresentationCore" />
    <Reference Include="PresentationFramework" />
  </ItemGroup>
  <ItemGroup>
    <Page Include="MainWindow.xaml">
      <Generator>MSBuild:Compile</Generator>
      <SubType>Designer</SubType>
    </Page>
    <Compile Include="MainWindow.xaml.cs">
      <DependentUpon>MainWindow.xaml</DependentUpon>
      <SubType>Code</SubType>
    </Compile>
  </ItemGroup>
  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
</Project>

解：

下面的代码段将编译代码，创建的DLL文件，并经由反射使用创建的DLL。发生这种情况（所有的）应用程序运行时。

特别感谢道格这个计算器问题

    private void TestCase4_OnClick(object sender, RoutedEventArgs e)
    {
        var globalProperties = new Dictionary<string, string>();
        var buildRequest = new BuildRequestData(@"C:\Users\jbu\wpftest\wpftest.csproj", globalProperties, null, new string[] { "Build" }, null);
        var pc = new ProjectCollection();

        var result = BuildManager.DefaultBuildManager.Build(new BuildParameters(pc), buildRequest);

        Assembly assembly = Assembly.LoadFrom(@"C:\Users\jbu\wpftest\bin\Debug\wpftest.dll");
        var instance = assembly.CreateInstance("wpftest.MainWindow") as Window;

        if (instance != null)
        {
            instance.Show();
        }
    }